Servo current draw
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Servo current draw
Guten Tag. I have a relatively heavy model truck controlled by an SFR1. I've noticed the truck will slow slightly when full steering is applied. I suspect this is because I am using a 9Kg servo, which is current hungry but necessary to steer the model. It is running on S Bus and the servo is controlled through the SFR1. Battery voltage is 7.2 My question is: is it possible / safe to run the servo power lead (only) direct to the battery? I'm wondering if a direct voltage feed would lessen the effect it's having on motor control. Any thoughts appreciated. Danke Colin.
Re: Servo current draw
Hello Colin,
If that applies you can adjust the steering rod or apply the servo travel in your transmitter or adjust the steering limit in the SFR-1 (see Configuration > Speed Controller > Steering).
that's possible if the servo is a HV (high-voltage) servo, i.e. it must be able to handle up to 8,4V if the battery is fully charged. If the servo is not suitable you may use an external SBEC/UBEC to power the servo with 5V or 6V.ColinPT0357 hat geschrieben: ↑Sa 28. Jan 2023, 14:40is it possible / safe to run the servo power lead (only) direct to the battery?
Before you do that I recommend to check if the servo tries to turn too far and hits a mechanical stop when full steering is applied, which would cause it to draw a higher current. Often you can hear the servo buzz in such a case.I'm wondering if a direct voltage feed would lessen the effect it's having on motor control. Any thoughts appreciated.
If that applies you can adjust the steering rod or apply the servo travel in your transmitter or adjust the steering limit in the SFR-1 (see Configuration > Speed Controller > Steering).
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- Beiträge: 23
- Registriert: Fr 29. Jan 2021, 09:05
Re: Servo current draw
Hi Rascal
Once again, thank you for replying to one of my posts!
The servo can handle 8.4 volts and the steering is limited by transmitter end points so there's no 'overrun', which, as you say, might cause further current draw. No, I notice a slight speed drop and even some dimming of leds with just a moderate steer (not full lock) while running.
Given the above I don't believe I need a separate voltage reg (UBEC) and I would like to try out routing the servo red (+) lead direct to the battery. Obviously the signal and negative wires would stay connected to X5,L. Sorry to ask again, doing this won't damage the SFR1?
Appreciate your help.
Colin T
Once again, thank you for replying to one of my posts!
The servo can handle 8.4 volts and the steering is limited by transmitter end points so there's no 'overrun', which, as you say, might cause further current draw. No, I notice a slight speed drop and even some dimming of leds with just a moderate steer (not full lock) while running.
Given the above I don't believe I need a separate voltage reg (UBEC) and I would like to try out routing the servo red (+) lead direct to the battery. Obviously the signal and negative wires would stay connected to X5,L. Sorry to ask again, doing this won't damage the SFR1?
Appreciate your help.
Colin T
Re: Servo current draw
Hello Colin,
that should be no problem as the higher voltage will only be applied to the servo and not the SFR-1.ColinPT0357 hat geschrieben: ↑Sa 28. Jan 2023, 21:20 ... I would like to try out routing the servo red (+) lead direct to the battery. Obviously the signal and negative wires would stay connected to X5,L. Sorry to ask again, doing this won't damage the SFR1?
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- Beiträge: 23
- Registriert: Fr 29. Jan 2021, 09:05
Re: Servo current draw
Thank you Rascal.